Quoted from X-Ray47:I would like to safely connect my Hallmark Enterprise (and Kelvin) to the GI in my Star Trek Pro. I have the wires ready to go. Do I need resistors or diodes? How is it done. Both models run on 4.5 vdc but I want to save the 5/12v by the coin door for a future color dmd. I sure would appreciate any help, I’m stumped.
maybe ask in the star trek owner thread, im sure someone has done it there before.
https://pinside.com/pinball/forum/topic/star-trek-clubmembers-only